The Redmi Note 14 5G supports distinguishing between the main SIM card and the secondary SIM card.
For your reference, here are more details about the differences:
1. The main SIM has priority when it comes to network access, especially for calls, texts, and data. This SIM is the default SIM for sending messages, making calls, and using mobile data unless you specify otherwise in the settings;
2. The secondary SIM has fewer features or is restricted in some regions depending on the carrier or phone configuration. It is used for secondary purposes like receiving calls or using data only if the primary SIM isn't in use, but it has lower priority for tasks like data transfer or call handling.